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The following figure can generate: triangle wave generation circuit diagram square wave generation circuit diagram sine wave generation circuit diagram 
Working principle description: 
We are professional factory for the SD Card and SD Micro.
Welcome you to visit factory for long term cooperation.
We also can do you own brand logo...
32GB 64GB 128GB
with Retail box
At present, we can supply the Black/ blue color of SD card from 64MB/ 128MB/ 256MB/ 512MB/ 1GB/2GB/4GB/8GB/16GB/32GB/64GB/128GB/256GB/512GB....Stocks everyday to ensure the fast one day shipping.
high speed sd card, camera data memory card ,digital 16gb 32gb 64gb,sd card,SD CARD
MICROBITS TECHNOLOGY LIMITED , https://www.hkmicrobits.com